code: def keys(self):
      # TODO return sorted(self.object)
      keys = list(self.object)
      try:
          keys.sort()
      except:
          pass
      return keys
  
imports: from reprlib import Repr
  from idlelib.tree import TreeItem, TreeNode, ScrolledCanvas
label_desc: Use image node_id 1 for calling the DictTreeItem obj's underlying member method code with example usage: obj.keys() and returns: keys